Glass-blowing machine



June 3, 1930. N 1,761,665

GLASS BLOWING MACHINEL Filed June 10, 1929 2 Sheets-Sheet 1 kiwi/V705Hans Hillmann June 3, 1930. L A 1,761,665

GLASS BL WING MACHINE I Filed June 10, 1929 2 Sheets-Shani 2 Fig. 2.

//VIE/V70A Hans Hi Zlmarcn I mom/[rs Patented June 3, 1930.

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SYNDICATE, LmrrED, on LONDON, ENGLAND rinses-BLOWIN momN'n Applicationfiled June 10, 1929,5erial No. 369,858, and in Germany June 22, 1928.

In the case of centrally divided iblank moulds for glass-blowingmachines, it is important that during the suction of the glass into theblank-mould, not only should the 5 interior space of the blank-mould beevacuated, but also care should be taken to prevent any air enteringsaid interior from outside through the joints, during the suction stage.It has already been proposed to provide, in the divisional surfaces ofthe halves of the blank-mould, air passages from which the air enteringthrough the joints during the suction stage is aspirated in the same wayas the air from the interior space of the blank-mould. v

In the bottle blowing machines in which the cavity of the blank-mouldand the auxiliary passages disposed in the divisional planes'areconnected with a common suction and blowing pipe, care must be takenthat the air passagessituated in the joints are closed during theinjection of compressed air serving to press the ball or gob of glassagainst the inner walls of the blank-mould, since otherwise they wouldcontain compressed air which would enter the interior space of theblank-mould through the joints, thereby counter-acting the effect of theadmission of compressed air into said s ace. The closing of theauxiliary passages is effected by providing valves or similar closingdevice between said passages and the common-pipe serving fortheevacuation of air, and for the admission of compressed air forblowing,

which valves or the like automatically open under suction and closeduring blowing.

. A typical embodiment of the invention is illustrated in the drawing,in which Fig. 1, represents the'blank-mould during the suction stage,and Fig. 2 the blank-mould during the admission of compressed air.

a denotes a half of the blank-mould, with the divisional surface pointinforwards, i. e. radial to the machine. onsequently the divisional planeof the blank-mould lies in the plane of the drawing. 6 is the half ofthe neck mould, the divisional plane a: of which may be offset by 90 inrela tion to that of theblank-mould a. a is an air cylinder in which ismovably dispospd, in

known manner, a piston d carrying the plug e, on which is attached aplate f, having a plurality of holes 9. The cylinder 0 is connected withan air pipe h which communicates alternately with the compressed air orsuction pipe. Each half of the neck mould is provided with a bore 2'forming, at the hottom, a valve'seat k communicatingin. turn with a boreZ. A valve ball-.m plays on each valve seat. Each of-the bores lcommunicates with a passage 11. disposed in the divisional surfaces ofthe halves a of the blank-mould a. In the operative stage represented inFig. 1 the pipe 6 is under a vacuum. The piston (2 being drawndownwards, the plug is in its lower end position. Air is drawn inthrough the holes 9 so that the interior space 0 of the blank-mould isevacuated andthe glass can be drawn in. In consequence of the negativepressure prevailing in the cylinder 0 air can, however, also be suckedin from the passages n through the joints of the blank-mould in thedirection indicated by the arrow, since the li ht valve balls m lift atonce under the in uence of the vacuum. When the blank-mould has beenfilled with glass and the surplus lass has been cut oil, below theblank-moul by the knife p (see Fig. 2) the air supply is reversed,'sothat now compressed air enters the cylinder 0. The piston 03, with pluge, ascends. Compressed airacts on the ball of glass and presses itagainst the inner walls of the inner mould 0. At the same time, however,the

valve balls on are forced against their seats by the influence of thecompressed air, so that the compressed air cannot enter the passages andtherefore cannot disturb the premoulding in the mould. "In theembodiment represented, the automatic closing devices are shown in theform of ball valves, which are specially suitable for carrying out theinvention by reason of their simplicity and reliability. This, however,does not prevent the employment'of closing devices similar to ballvalves, for example cone valves, ring valves, plate valves and the like.I

In the specified construction these closin devices are located in theneck mould itsel This, however, does not preclude their interpositioninto the path of the suction and compressed air, in any other way.

1. In a divided blank mould, for 'a glass- ,5 blowing machine, havingassages disposed in the divisional planes, t e combinaton of meansproviding a common suction and blowing space communicating with saidpassages and the mould cavit and automatically acting valves dispose andsaid space.

2. In a divided blank mould, for a glassblowing machine, having passagesdisposed in the divisional planes, the combination of means providing acommon suction and blowing space communicating with said assages and themould cavity, and ball va ves disposed between said passages and saidspace for closing said passages during the b owing stage.

3. In a divided blank mould and neck mould combination, for aglass-blowinginachine, wherein the blank mould has passages in thedivisional planes and the neck mould has borescommunic'ating with saidpassages, means providing a common suction and blowing spacecommunicating with said bores matically closing said passages during theblowing stage. 4.In a divided mould combination, for a glass-blowingmachine, wherein the blank mould has-passages in the divisional planesand the neck mould has bores communicating with said passages, meansproviding a common suction and blow-' ingspace communicating with saidbores and the mould cavity, and valves arranged to seat automatically insaid bores during the blowing stage. a 5. In a glass-blowing machine,the combination of a divided blank mould having passages dis osed in thedivisional planes, a coacting divided neck mould hav ng bores to ing toalign wi the mould cavity, a c 1113- der surmounting said neck mould toorm a common space in communication with said bores and central opening,means for alternately connecting said space with a source of suction andwith a source of su ply of pressure air, valves for 'automatica yclosing said passages during the air supply, a

' piston sli carried by said piston.

6. In a glass-blowing machine the combination of a divided blank mouldhaving passagesdisposed in thedivisional lanes, a coacting divided neckmould having bores to align with said passages and a central opening toalign wit-h the mould cavity, a cylinder surmounting said neck mould toform a common space in communication with said 7 bores and centralopening, means for alter- 35 nately connecting said space with a sourceGil between said passages and the mould cavit and valves for auto--blank mould and neck align with said passages and a central open-- ablein said cylinder, and a plug of suctionand with a source of supply ofpressure air, valves for automatical y clos- .1ng said assages duringthe air supply, a

piston sli able in said cylinder, a plug carried b said piston, and aported member on said p ug arran ed to seat on said neck mould over itscentre opening during the suction stage. I

7. In a glass-blowing machine, the combination of a divided blank mouldhaving passages dis osed in the divisional planes, a coacting dividedneck mould having bores to align with said passages and a centralopening to align with the mould cavity, a cylinder surmounting said neckmould to form a common space in communication with said bores andcentral opening, means for alternately connecting said space with asource of suction and with a source of supply of pressure air, valvesarranged to seat in said bores during the air supply, a piston slidablein said cylinder, and a plug carried by said piston.

8. In a glass-blowing machine, the combination of a divided blank mouldhaving passages disposed in the divisional planes, a coacting dividedneck mould having bores to align with said passages and a centralopening to align with the mould cavity, a cylinder surmounting said neckmould to form a common space in communication with said bores andcentral opening, means for alternately connectingsaid space with asource of suction and with a source of supply of ressure air, valvesarranged to seat in'said ores during the air supply, a piston slidablein said cylinder, a plug carried by said piston, and a ported member onsaid plug ar ranged to seat on said neck mould over its central 0 eningduring the suction stage.

In testimony whereof I aflix my signature.

HANS HILLMANN.

